刮擦“请求 url 中缺少方案"; [英] scrapy "Missing scheme in request url"
问题描述
下面是我的代码-
import scrapy
from scrapy.http import Request
class lyricsFetch(scrapy.Spider):
name = "lyricsFetch"
allowed_domains = ["metrolyrics.com"]
print "\nEnter the name of the ARTIST of the song for which you want the lyrics for. Minimise the spelling mistakes, if possible."
artist_name = raw_input('>')
print "\nNow comes the main part. Enter the NAME of the song itself now. Again, try not to have any spelling mistakes."
song_name = raw_input('>')
artist_name = artist_name.replace(" ", "_")
song_name = song_name.replace(" ","_")
first_letter = artist_name[0]
print artist_name
print song_name
start_urls = ["www.lyricsmode.com/lyrics/"+first_letter+"/"+artist_name+"/"+song_name+".html" ]
print "\nParsing this link\t "+ str(start_urls)
def start_requests(self):
yield Request("www.lyricsmode.com/feed.xml")
def parse(self, response):
lyrics = response.xpath('//p[@id="lyrics_text"]/text()').extract()
with open ("lyrics.txt",'wb') as lyr:
lyr.write(str(lyrics))
#yield lyrics
print lyrics
当我使用scrapy shell 时,我得到了正确的输出,但是,每当我尝试使用scrapy crawl 运行脚本时,我都会得到ValueError.我究竟做错了什么?我浏览了这个网站和其他网站,但一无所获.我想到了通过这里的另一个问题提出请求,但它仍然没有用.有什么帮助吗?
I get the correct output when I use the scrapy shell, however, whenever I try to run the script using scrapy crawl I get the ValueError. What am I doing wrong? I went through this site, and others, and came up with nothing. I got the idea of yielding a request through another question over here, but it still didn't work. Any help?
我的回溯-
Enter the name of the ARTIST of the song for which you want the lyrics for. Minimise the spelling mistakes, if possible.
>bullet for my valentine
Now comes the main part. Enter the NAME of the song itself now. Again, try not to have any spelling mistakes.
>your betrayal
bullet_for_my_valentine
your_betrayal
Parsing this link ['www.lyricsmode.com/lyrics/b/bullet_for_my_valentine/your_betrayal.html']
2016-01-24 19:58:25 [scrapy] INFO: Scrapy 1.0.3 started (bot: lyricsFetch)
2016-01-24 19:58:25 [scrapy] INFO: Optional features available: ssl, http11
2016-01-24 19:58:25 [scrapy] INFO: Overridden settings: {'NEWSPIDER_MODULE': 'lyricsFetch.spiders', 'SPIDER_MODULES': ['lyricsFetch.spiders'], 'BOT_NAME': 'lyricsFetch'}
2016-01-24 19:58:27 [scrapy] INFO: Enabled extensions: CloseSpider, TelnetConsole, LogStats, CoreStats, SpiderState
2016-01-24 19:58:28 [scrapy] INFO: Enabled downloader middlewares: HttpAuthMiddleware, DownloadTimeoutMiddleware, UserAgentMiddleware, RetryMiddleware, DefaultHeadersMiddleware, MetaRefreshMiddleware, HttpCompressionMiddleware, RedirectMiddleware, CookiesMiddleware, ChunkedTransferMiddleware, DownloaderStats
2016-01-24 19:58:28 [scrapy] INFO: Enabled spider middlewares: HttpErrorMiddleware, OffsiteMiddleware, RefererMiddleware, UrlLengthMiddleware, DepthMiddleware
2016-01-24 19:58:28 [scrapy] INFO: Enabled item pipelines:
2016-01-24 19:58:28 [scrapy] INFO: Spider opened
2016-01-24 19:58:28 [scrapy] INFO: Crawled 0 pages (at 0 pages/min), scraped 0 items (at 0 items/min)
2016-01-24 19:58:28 [scrapy] DEBUG: Telnet console listening on 127.0.0.1:6023
2016-01-24 19:58:28 [scrapy] ERROR: Error while obtaining start requests
Traceback (most recent call last):
File "C:\Users\Nishank\Miniconda2\lib\site-packages\scrapy\core\engine.py", line 110, in _next_request
request = next(slot.start_requests)
File "C:\Users\Nishank\Desktop\SNU\Python\lyricsFetch\lyricsFetch\spiders\lyricsFetch.py", line 26, in start_requests
yield Request("www.lyricsmode.com/feed.xml")
File "C:\Users\Nishank\Miniconda2\lib\site-packages\scrapy\http\request\__init__.py", line 24, in __init__
self._set_url(url)
File "C:\Users\Nishank\Miniconda2\lib\site-packages\scrapy\http\request\__init__.py", line 59, in _set_url
raise ValueError('Missing scheme in request url: %s' % self._url)
ValueError: Missing scheme in request url: www.lyricsmode.com/feed.xml
2016-01-24 19:58:28 [scrapy] INFO: Closing spider (finished)
2016-01-24 19:58:28 [scrapy] INFO: Dumping Scrapy stats:
{'finish_reason': 'finished',
'finish_time': datetime.datetime(2016, 1, 24, 14, 28, 28, 231000),
'log_count/DEBUG': 1,
'log_count/ERROR': 1,
'log_count/INFO': 7,
'start_time': datetime.datetime(2016, 1, 24, 14, 28, 28, 215000)}
2016-01-24 19:58:28 [scrapy] INFO: Spider closed (finished)
推荐答案
正如@tintin 所说,您在 URL 中缺少 http
方案.Scrapy 需要完全限定的 URL 才能处理请求.
As @tintin said, you are missing the http
scheme in the URLs. Scrapy needs fully qualified URLs in order to process the requests.
据我所知,您缺少以下方案:
As far I can see, you are missing the scheme in:
start_urls = ["www.lyricsmode.com/lyrics/ ...
和
yield Request("www.lyricsmode.com/feed.xml")
如果您要从 HTML 内容中解析 URL,则应使用 urljoin
来确保获得完全限定的 URL,例如:
In case you are parsing URLs from the HTML content, you should use urljoin
to ensure you get a fully qualified URL, for example:
next_url = response.urljoin(href)
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